Flexible spring hinge for chair back and seat



FIG. 1 is a rear, lower, perspective view of a flexible spring hinge for a chair back and seat, showing my new design; the broken lines indicating a chair are shown for illustrative purposes only and form no part of the claimed design;

FIG. 2 is an enlarged, lower rear perspective view thereof.

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a right side elevational view thereof, the left side being a mirror image thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a front elevational view thereof; and,

FIG. 7 is a top plan view thereof.

FIGS. 3 through 7 have been shown on a reduced scale in respect to FIG. 2 but on an enlarged scale with respect to FIG. 1. 

The ornamental design for a flexible spring hinge for chair back and seat, as shown and described. 